Guild Wars 2

It’s either bugged or a tool tip inaccuracy, but yes it ticks just 13 times.
However, the swarm shows 15 sec as much as the non-traited 10 ticks show their animation for 12 sec. When the swarm stops hitting the animation slowly gets smaller, so the traited 13 ticks do match their animation.

yes it is bugged, its noted on the wiki. It should go for a full 15 seconds.

yes comfirmed, an old bug at that too. with so many, i’ve lost count. it is very similar to the spectral attunement/spectral wall one where you only get the during increase of the wall alone and not an increase of the protection or the fear. im surprised anet didn’t fix that when they fix spectral attunement/spectral armor.